WO2022190268A1

WO2022190268A1 - Outdoor unit for air conditioner

Info

Publication number: WO2022190268A1
Application number: PCT/JP2021/009566
Authority: WO
Inventors: 慶和矢次; 健篠▲崎▼; 隆二百瀬; 浩一有澤; 貴昭 ▲高▼原; 啓介植村
Original assignee: 三菱電機株式会社
Priority date: 2021-03-10
Filing date: 2021-03-10
Publication date: 2022-09-15
Also published as: JPWO2022190268A1; DE112021007237T5; JP7422936B2; US20240125489A1; CN116940793A

Abstract

The present disclosure provides an outdoor unit for an air conditioner with improved reliability.　An outdoor unit (1000) has a housing, the interior of which is divided into a fan room (110) and a machine room (120). A compressor and reactor as heat-generating components are installed below the machine room (120). Installed above the heat-generating components are an electrical board (50) including a printed circuit board (51) and an electrical component (52), and an electrical component box (10) comprising an inner box (11) and an outer box (12) for storing the electrical board. The lower surface (first heat-insulating plate) of the inner box and the lower surface (second heat-insulating plate) of the outer box constitute a double heat-insulating plate (10a).

Description

Air conditioner outdoor unit

The present disclosure relates to an outdoor unit of an air conditioner.

Conventionally, in order to increase the cooling efficiency of the electrical boards provided in the outdoor unit of the air conditioner, there was a technique of taking outside air into the electrical component box that accommodates the electrical boards (see Patent Document 1, for example).

JP-A-11-002435

However, when outside air is blown into the electrical component box, dust or the like adheres to the electrical component board housed in the electrical component box. rice field.

The present disclosure has been made to solve the above-described problems, and aims to improve the reliability of outdoor units of air conditioners.

The outdoor unit of the air conditioner according to the present disclosure includes a housing whose interior is divided into a machine room and a fan room by a partition plate, a heat exchanger provided in the fan room, and a heat exchanger provided in the fan room from the outside of the housing. a blower fan for taking in air; a heat-generating component provided in the machine chamber; an electrical substrate provided above the heat-generating component and including a printed circuit board and electrical components; and a double insulation board including a second insulation board disposed below the first insulation board with a space therebetween.

The outdoor unit of the air conditioner according to the present disclosure has the effect of improving reliability.

Fig. 2 is a perspective view of the outdoor unit of Embodiment 1 as seen from the front side with a part of the housing being transparent; It is the figure which looked at the S1 cross section of the outdoor unit of Embodiment 1 from the upper side. It is the figure which looked at the S2 cross section of the outdoor unit of Embodiment 1 from the fan room side. It is the figure which looked at the A section of the outdoor unit of Embodiment 1 from the front side. FIG. 3 is a perspective view showing an electric component box provided in the outdoor unit of Embodiment 1; FIG. 3 is a perspective view showing an inner box of an electric component box provided in the outdoor unit of Embodiment 1; It is the figure which looked at the part corresponding to the A section of the outdoor unit of Embodiment 2 from the front side. FIG. 11 is a perspective view showing an electric component box provided in the outdoor unit of Embodiment 2; It is the figure which looked at the part corresponding to the A section of the outdoor unit of Embodiment 3 from the front side. FIG. 12 is a front view of a portion corresponding to the A section of the outdoor unit of Embodiment 4;

Embodiments will be described below based on the drawings. In the drawings below, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated.

Embodiment 1.
An outdoor unit of an air conditioner according to Embodiment 1 will be described with reference to FIGS. 1 to 6. FIG.

First, the overall configuration of the outdoor unit of the air conditioner of Embodiment 1 will be described using FIGS. 1 to 3. FIG. FIG. 1 is a perspective view of the outdoor unit 1000 of the present embodiment as seen from the front side with part of the housing 200 being transparent. 2 is a view of the S1 cross section shown in FIG. 1 of the outdoor unit 1000 seen from above, and FIG. 3 is a view of the S2 cross section shown in FIG. 1 of the outdoor unit 1000 seen from the fan room side.

In the present disclosure, for convenience of explanation, in the outdoor unit 1000 shown in FIG. 1 , the side on which the front panel 203 is provided is the “front side”, and the side on which the rear panel 204 is provided is the “rear side”. , the side on which the top panel 201 is provided is referred to as the "upper side", the side on which the bottom panel 202 is provided is referred to as the "lower side", and the left side of the paper is provided with the fan chamber 110. The "fan room side" and the side where the machine room 120 is provided on the right side of the paper may be called the "machine room side". Similarly, the upward direction in FIG. 1 may be called "upper", and the downward direction in FIG. 1 may be called "downward".

The air conditioner described in this embodiment includes an outdoor unit 1000 (shown in FIG. 1) installed outdoors and an indoor unit (not shown) installed indoors. The outdoor unit 1000 of the present embodiment is connected to the indoor unit by refrigerant pipes to form a refrigeration cycle. The outdoor unit 1000 is also connected to the indoor unit by power lines and signal lines for controlling the operation of the refrigeration cycle.

As shown in FIGS. 1 to 3, the outdoor unit 1000 includes a housing 200 whose inside is divided into a fan room 110 and a machine room 120 by a partition plate 100, a heat exchanger 2 provided in the fan room 110, a fan A blower fan 3 provided in the chamber 110 for taking in and discharging air from the outside of the housing 200, a compressor 7 and a reactor 8 serving as heat-generating components provided below the machine chamber 120, and an electrical board 50 (Fig. 1 to 3) are provided. The electrical component box 10 includes, as part of its configuration, a double heat insulating plate 10a provided between the electrical component board 50 and the compressor 7 and reactor 8 as heat generating components.

The housing 200 is composed of a top panel 201, a bottom panel 202, a front panel 203, a rear panel 204, a side panel 205, and a side panel 206, as shown in FIG. Each panel constituting the housing 200 can be formed by sheet metal processing, for example. Note that FIG. 1 shows a top panel 201 and a front panel 203, which are part of the housing 200, in a transparent state. In the housing 200, the top panel 201, the bottom panel 202, the front panel 203, the rear panel 204, the side panel 205, and the side panel 206 may be configured as independent panels. Two or more panels may be integrally constructed, such as integrally with the panel 205 .

The housing 200 has an intake port and an exhaust port for taking in and discharging outside air by the blower fan 3 . More specifically, the side panel 205 and the rear panel 204 are formed with air intake ports as a plurality of through-holes to allow outside air to flow into the fan chamber 110 . In addition, the side panel 206 is also formed with an air intake port as a through hole in order to let outside air flow into the machine room 120 . On the other hand, the exhaust port is formed in the area surrounded by the bell mouth 5 on the front panel 203 shown in FIG. The air flow in the outdoor unit 1000 will be described later.

A partition plate 100 formed by, for example, sheet metal processing is provided inside the housing 200 . As shown in FIGS. 1 and 2 , the interior of the housing 200 is divided into two spaces by the partition plate 100 . One of the two spaces is the fan room 110 located on the left side when facing the front in FIG. The other space is the machine room 120 located on the right side when facing the front in FIG.

As shown in FIG. 1, the heat exchanger 2, the blower fan 3, the bell mouth 5, etc. are arranged in the fan room 110. On the other hand, in the machine room 120, the compressor 7, the reactor 8, and the like are arranged as heat-generating components. 1 and 2, the electrical component box 10 that accommodates the electrical component board 50 is provided across the fan room 110 and the machine room 120. As shown in FIGS.

The configuration of the fan room 110 side of the outdoor unit 1000 will be described in detail.

As shown in FIGS. 1 and 2 , the heat exchanger 2 is L-shaped in cross section and arranged along the side panel 205 and the rear panel 204 of the housing 200 . Although not shown, the heat exchanger 2 includes a plurality of fins made of metal and a plurality of refrigerant pipes passing through the fins. The heat exchanger 2 constitutes a part of the refrigeration cycle of the air conditioner, and is connected to the compressor 7 and the like via refrigerant pipes.

As shown in FIG. 1, the blower fan 3 is fixed to the support plate 4 provided inside the housing 200 by screwing or the like. As the blower fan 3 rotates, outside air is taken into the housing 200 through the air inlet of the housing 200 described above, and the air inside the housing 200 is discharged from the air outlet of the housing 200 . Thus, the blower fan 3 generates an airflow by operating.

The bell mouth 5 is provided inside the front panel 203 so as to surround the exhaust port formed in the front panel 203, as shown in FIGS. As shown in FIG. 3 , an annular projecting portion 5 a projecting toward the interior of the housing 200 is formed on the peripheral portion of the bell mouth 5 . The projecting portion 5a has a function of guiding the airflow generated by the blower fan 3 toward the exhaust port.

Next, the configuration of the machine room 120 side of the outdoor unit 1000 will be described in detail.

As shown in FIG. 1, the compressor 7 is provided in the machine room 120 and fixed to the bottom panel 202 via the anti-vibration rubber 7a. The compressor 7 is connected to the heat exchanger 2 and the like that constitute the refrigerating cycle through refrigerant pipes, and has a function of circulating the refrigerant in the refrigerating cycle. Also, the compressor 7 is a heat-generating component that generates heat by its operation.

The reactor 8 is provided in the machine room 120 and fixed above the compressor 7, as shown in FIG. Although not shown, the reactor 8 is composed of a core laminated with electromagnetic steel sheets, a coil such as a copper wire wound around the core, and a metal base plate welded to the end surface of the core. . A base plate of the reactor 8 is fixed to the partition plate 100 with a fixing member such as a screw. Reactor 8 has the function of improving the power factor of the AC power supply. Also, the reactor 8 is a heat-generating component that generates heat by its operation.

Although not shown, the machine room 120 also includes an expansion valve, a four-way valve, refrigerant pipes, and electric wiring that connects parts, which constitute a refrigeration cycle.

Also, an electrical component box 10 is arranged in the A section shown in FIG. A cushion material 9 made of a foamed resin material or the like is provided between the electrical component box 10 and the top panel 201 . The electrical component box 10 includes a double heat insulating plate 10a as part of its configuration, and the electrical component board 50 is accommodated inside the electrical component box 10. As shown in FIG.

Here, the details of the A part in FIG. 1 will be explained using FIGS. 4 to 6. FIG. 4 is a front view of the A portion of the outdoor unit 1000 of this embodiment. 5 is a perspective view showing the electrical component box 10 provided in the outdoor unit 1000, and FIG. 6 is a perspective view showing the inner box 11 of the electrical component box 10. As shown in FIG.

The electrical component box 10 is composed of an inner box 11 and an outer box 12, as shown in FIGS. As shown in FIG. 4, the electrical component box 10 has a double heat insulating plate 10a consisting of the bottom surface of the inner box 11 (first heat insulating plate) and the bottom surface of the outer case 12 (second heat insulating plate). An electrical board 50 is housed inside the inner box 11 . The outer box 12 is provided to cover at least the machine room side of the inner box 11 .

The inner box 11 is provided across the fan room 110 and the machine room 120, as shown in FIG. As shown in FIGS. 4 to 6, electrical wiring ( (not shown) is formed. A gap is formed between the outlet 11a and the electric wiring. A closed space of the box 11 can be maintained. Further, the outlet 11a is not limited to one formed on the lower surface of the inner case 11, but may be formed on the side surface, or a plurality of outlets may be formed.

A heat sink 53 is attached to the inner box 11 so that the heat radiation fins 53b are exposed to the outside of the inner box 11, as shown in FIGS. As shown in FIG. 4, the inner box 11 and the heat sink base plate 53a of the heat sink 53 form a box-like shape for accommodating the electrical board 50. As shown in FIG. The inner box 11 is composed of a plurality of plate-like members, and is made of, for example, a metal material. Specifically, the inner box 11 can be formed, for example, by bending a sheet metal to form a box shape with an open top, and attaching a lid cover from above by screwing. Note that the shape of the inner box 11 is simplified in FIG. 6 and the like.

The outer box 12 is provided across the fan room 110 and the machine room 120, as shown in FIG. As shown in FIGS. 4 and 5, electrical wiring (not shown) necessary for electrical connection between the electrical board 50, the blower fan 3, the compressor 7, the reactor 8, and the like is provided on the lower surface of the outer casing 12, as shown in FIGS. is formed. In this way, by passing the electrical wiring through the outlet 11a of the inner box 11 and the outlet 12a of the outer box 12, the electrical board 50 housed in the electrical component box 10 and the electrical board 50 provided outside the electrical component box 10 are connected. It is possible to connect the compressor 7 and the reactor 8, etc., which are connected.

The outer box 12 is composed of a plurality of plate-shaped members. The outer box 12 is made of, for example, a lower surface made of a resin material with low thermal conductivity, and other surfaces made of a metal material. Specifically, for example, the outer box 12 is formed into a box

shape having openings

12b and 12c as shown in FIG. be able to. Note that the shape of the outer case 12 is simplified in FIG. 5 and the like.

On the right side of the outer casing 12 as viewed from the front, that is, on the side of the machine room, an opening 12b is formed for allowing air to flow in through the intake port of the side panel 206. Further, an opening 12c through which air can flow out to the fan chamber 110 is formed on the left side of the outer casing 12 as viewed from the front, that is, on the fan chamber side. As shown in FIG. 4, the opening 12b is formed in the machine room 120 and the opening 12c is formed in the fan room 110. As shown in FIG. In addition, the outer box 12 is supported by the partition plate 100 in order to prevent it from falling due to its own weight.

A uniform gap of about 5 mm is provided between the inner box 11 and the outer box 12 . However, the inner box 11 and the outer box 12 are fixed and supported, respectively, and there may exist a region where the inner box 11 and the outer box 12 contact each other in the supporting portion. As shown in FIG. 4, by providing a space between the inner box 11 and the outer box 12, the air passing through the space between the inner box 11 and the outer box 12 from the opening 12b flows from the opening 12c. It can be said that the machine room 120 and the fan room 110 are in communication with each other.

The electrical component box 10 includes a double heat insulating plate 10a formed by the bottom surface of the inner box 11 (first heat insulating plate) and the bottom surface of the outer box 12 (second heat insulating plate), as shown in FIG. The double heat insulating plate 10 a is provided between the compressor 7 and the reactor 8 as heat generating components and the electrical board 50 . More specifically, the double heat insulating plate 10 a is arranged above the compressor 7 and the reactor 8 as heat generating components provided in the machine room 120 and below the electrical board 50 . Further, as described above, there is a gap (space ) is formed. Furthermore, the lower surface (first heat insulating plate) of the inner case 11 is made of, for example, a metal material, and the lower surface (second insulating plate) of the outer case 12 is made of, for example, a resin material. That is, the lower surface (second insulating plate) of the outer case 12 is made of a material having a lower thermal conductivity than the lower surface (first insulating plate) of the inner case 11 .

The electrical board 50 is housed inside the electrical component box 10 consisting of the inner box 11 and the outer box 12 described above. The electrical board 50 has a printed board 51 and a plurality of electrical components 52 mounted on the printed board 51 (below the printed board 51). The electrical board 50 controls the power supply of the air conditioner and the operation of equipment such as the compressor 7 .

The printed circuit board 51 is a plate-like wiring board, as shown in FIG. The printed circuit board 51 is provided so that one surface faces the upper surface of the inner box 11 of the electrical component box 10 . Note that the printed circuit board 51 is not limited to a printed circuit board as long as it is a board on which electrical components can be mounted.

The plurality of electrical components 52 are, for example, two power control components 52a, a capacitor 52b, a resistor 52c, and a coil 52d, as shown in FIG. Among them, the power supply control component 52a is a power device and is provided on the fan room side. A heat sink 53 is attached to the power control component 52a. Note that the specific configuration of the electrical component 52 here is an example, and is not limited to this.

The power supply control component 52a is attached to the printed circuit board 51 via a resin spacer (not shown). Terminals of the power control component 52 a are soldered to the printed circuit board 51 . The power control component 52 a is the component that generates the most heat among the plurality of electrical components 52 mounted on the printed circuit board 51 .

A heat sink 53 for dissipating heat generated from the power control component 52a is attached to the surface of the power control component 52a opposite to the surface soldered to the printed circuit board 51 (below the power control component 52a). The heat sink 53 is composed of a heat sink base plate 53a and a plurality of radiation fins 53b.

More specifically, the heat sink 53 is constructed by arranging a plurality of heat radiation fins 53b on one surface of a heat sink base plate 53a. The heat radiation fins 53b are plate-like members extending vertically downward from the heat sink base plate 53a and having rectangular heat radiation surfaces on the front and back sides. Such radiating fins 53b are arranged at regular intervals. The other surface of the heat sink base plate 53a, that is, the surface opposite to the surface provided with the heat radiating fins 53b, is abutted against the power supply control component 52a via heat conductive grease or a heat conductive sheet.

Although the heat sink 53 is supported by the inner box 11 in this embodiment, it is not limited to this. For example, the periphery of the heat sink base plate 53a may be fixed to the inner casing 11 via a resin heat sink holder (not shown) and supported downward, that is, in the direction of gravity. In this case, the heat sink holder is fixed to the inner box 11 with screws or the like.

Next, the air flow during operation of the outdoor unit 1000 will be described.

First, by operating the blower fan 3 provided in the fan room 110, an air current flowing from the outside of the outdoor unit 1000 to the fan room 110 is formed. More specifically, outside air is taken into the fan chamber 110 from air intakes formed in the side panel 205 and the rear panel 204, and heat is exchanged between the refrigerant flowing through the refrigerant pipes of the heat exchanger 2 and the air. . Here, when the air conditioner is in cooling operation, the refrigerant in the heat exchanger 2 of the outdoor unit 1000 gives heat to the air, so the temperature of the air passing through the heat exchanger 2 becomes higher than the outside air temperature. On the other hand, during heating operation, the refrigerant takes heat from the air, so the temperature of the air passing through the heat exchanger 2 becomes lower than the outside air temperature.

The air that has flowed into the fan chamber 110 through the heat exchanger 2 in this way is guided by the bell mouth 5 having a depression on the inside, and is discharged out of the outdoor unit 1000 through the exhaust port of the front panel 203. be. At this time, part of the airflow passes through the heat radiating fins 53b of the heat sink 53, thereby promoting heat dissipation by the heat radiating fins 53b.

Here, since the air pressure in the fan room 110 is lowered by the blower fan 3 discharging the air in the fan room 110, the air pressure in the outer box 12 communicating with the fan room 110 is higher than that in the fan room 110, and the outside air Atmospheric pressure becomes lower. Therefore, when the blower fan 3 operates, an air current is generated from the intake port of the side panel 206 toward the inside of the housing 200 . In this way, the air that has flowed into the machine room 120 from the intake port of the side panel 206 passes through the space formed between the outer box 12 and the inner box 11, flows into the fan room 110, and then flows into the bell mouth. 5 and discharged from the exhaust port of the front panel 203 .

The effect of the air conditioner outdoor unit 1000 configured in this way will be described.

In order to control the operation of an air conditioner that has an outdoor unit and an indoor unit, when the electric circuit board is energized and the refrigeration cycle is controlled, electric parts such as power control parts generate heat. Here, the power control component generates the largest amount of heat among the plurality of electric components, and the power control component can be cooled by a heat sink. On the other hand, other electric parts such as capacitors, resistors, and coils generate less heat than the power control parts, so the heat generated by the electric parts themselves can be cooled by natural air cooling.

Here, the compressor and reactor are placed below the machine room. Compressors and reactors are heat-generating components that are hot compared to electrical components such as capacitors, resistors, and coils. Furthermore, during cooling operation, the temperature of the air passing through the heat exchanger is about 10°C higher than the outside air temperature, so the partition plate provided inside the housing becomes hot relative to the outside air, raising the temperature of the air inside the machine room. Let Therefore, especially during cooling operation, the temperature of the electrical parts constituting the electrical board rises in an environment where the temperature is raised with respect to the outside air.

Therefore, the air conditioner outdoor unit 1000 of the present embodiment has an electrical component box 10 that houses the electrical component board 50. The electrical component box 10 includes the compressor 7 and the reactor 8 as heat-generating components, and a double heat insulating plate 10a provided between and as part of its configuration. Since the outdoor unit 1000 has such a double heat insulating plate 10a, the electrical components 52 constituting the electrical board 50 are less susceptible to the heat from the compressor 7 and the reactor 8 as heat generating components, thereby improving reliability. There is an effect that the property can be improved.

More specifically, the double structure of the inner box 11 and the outer box 12 not only shields heat from the heat source but also provides an air layer between the inner box 11 and the outer box 12. Therefore, the heat insulation performance can be further improved. In addition, of the double heat insulating plates 10a, the lower surface of the outer case 12, that is, the plate on the side of the heat-generating component is made of resin. produce the effect possible.

Also, the electrical parts 52 arranged on the side of the machine room 120 may be short-circuited or corroded due to adhesion of dust, humidity changes, etc., and there is a concern that reliability may decrease due to defects. Since the outdoor unit 1000 is installed in various outdoor environments, it is desirable not to expose the electrical components mounted on the electrical board 50 to the outside air in order to prevent dust and the like from adhering to them as much as possible.

Therefore, in the air conditioner outdoor unit 1000 of the present embodiment, the inner box 11 that houses the electrical board 50 forms a closed space, so that the influence of dust and the outside air can be suppressed, and the reliability is improved. An effect that can be further improved is exhibited. In addition, since the inside of the inner box 11 becomes a closed space, there is a concern that the temperature of the electrical components 52 constituting the electrical board 50 may rise, but air currents are generated in the space between the inner box 11 and the outer box 12 as described above. Therefore, the heat transfer on the surface of the inner box 11 can be promoted, and the temperature rise of the electric parts 52 can be reduced.

In addition, the air conditioner outdoor unit 1000 of the present embodiment has the effect of being able to suppress electrical noise generated from the electrical board 50 by forming the closed space with the inner box 11 .

Furthermore, in the air conditioner outdoor unit 1000 of the present embodiment, the inner box 11 forms a closed space, so that when a flammable refrigerant such as propane is used as a refrigerant circulating in the refrigeration cycle, a malfunction may occur. Even if leakage occurs, the effect of being able to prevent ignition is exhibited.

In this embodiment, the space between the inner box 11 and the outer box 12 is formed with a uniform gap of about 5 mm, but is not limited to this, and may be, for example, a gap of about 10 mm. may Also, the gaps do not have to be uniform, and for example, the gap formed below the inner box 11 can be made smaller than the gap formed above. In this way, air convection is reduced below the inner box 11 to suppress heat transfer to the lower surface of the inner box 11, and the heat insulating effect of the double heat insulating plate 10a can be enhanced. Since the flow rate of air is increased in comparison and heat transfer is promoted, it is possible to improve the cooling performance of the electrical component 52 .

In this embodiment, the lower surface of the outer casing 12 is located on the partition plate 100, and the case where the outer casing 12 as a whole is provided across the fan room 110 and the machine room 120 has been described. It is not limited. For example, when the outer case 12 is provided in the machine room 120 as a whole, it is desirable that the material of the side surface of the outer case 12 facing the partition plate 100 is also made of resin to improve the heat insulation performance. This is for suppressing heat transfer from the partition plate 100 . It should be noted that even when the outer casing 12 of the present embodiment is provided across the fan chamber 110 and the machine chamber 120, the outer casing 12 may be made of resin other than the lower surface. Not even.

Furthermore, not only is part of the outer casing 12 made of resin, but also a coating with a low emissivity is applied to suppress radiation, making it possible to obtain higher heat insulation performance.

In addition, in this embodiment, there are things called "boxes" such as "electric component box", "inner box" or "outer box", but they are not necessarily independent objects having walls on six sides. Not limited. Specifically, it may be configured in a box shape by combining a plurality of parts instead of being configured with a single component, or like the "outer box 12" of the present embodiment, Some side walls may be omitted.

Furthermore, in the present embodiment, the compressor 7 and the reactor 8 have been described as heat-generating components, but the present invention is not limited to this. 7 only. When the heat generation of the reactor 8 is small in this way, it is conceivable to house the reactor 8 inside the inner box 11 of the electrical component box 10 . In the outdoor unit 1000 configured in this way, the inner box 11 forms a closed space, so that the electric noise generated from the reactor 8 can be suppressed.

Embodiment 2.
An outdoor unit of an air conditioner according to Embodiment 2 will be described with reference to FIGS. 7 and 8. FIG. FIG. 7 is a front view of a portion of the outdoor unit of the present embodiment corresponding to part A in FIG. Moreover, FIG. 8 is a perspective view showing the inner box 21 of the electric component box 20 provided in the outdoor unit of the present embodiment.

As shown in FIG. 7, the outdoor unit of the present embodiment is provided with an electrical component box 20 instead of the electrical component box 10 provided in the A section of the outdoor unit 1000 of the first embodiment. Different from form 1. Since other configurations are the same as those of the outdoor unit 1000 of Embodiment 1, different points will be mainly described below.

The electrical component box 20 is composed of an inner box 21 and an outer box 22, as shown in FIG. The electrical component box 20 has a double heat insulating plate 20a consisting of the bottom surface of the inner box 21 (first heat insulating plate) and the bottom surface of the outer box 22 (second heat insulating plate). The electric parts 52 of the electric board 50 are accommodated inside the inner box 21 , and the printed board 51 is exposed to the outside of the inner box 21 . The outer box 22 is provided to cover at least the machine room side of the inner box 21 and the printed circuit board 51 .

The inner box 21 is provided across the fan room 110 and the machine room 120, as shown in FIG. An outlet 21a for electrical wiring is formed on the lower surface of the inner box 21 on the side of the machine room, like the inner box 11 of the first embodiment. The inner box 21 is different from the inner box 11 of the first embodiment in that the printed circuit board 51 constituting the electrical board 50 is formed to be exposed to the outside of the inner box 21 .

More specifically, the printed board 51 constituting the electrical board 50 also serves as the upper lid of the inner box 21, as shown in FIG. 8(A). The upper surface of the inner box 21 is formed with an opening each side of which is about 10 mm smaller than the outer shape of the printed circuit board 51, and is supported by a stepped plate of about 10 mm to prevent the printed circuit board 51 from falling. Further, the corners of the printed circuit board 51 may be fixed by screwing. In addition, in FIG. 8 and the like, these structures are illustrated in a partially simplified manner, and the inner box 21 may not have a stepped structure.

The outer box 22 is provided across the fan room 110 and the machine room 120, as shown in FIG. An outlet 22a for electrical wiring is formed on the lower surface of the outer case 22, like the outer case 12 of the first embodiment. Further, the outer case 22 has an opening 22b formed in the machine chamber 120 and an opening 22c formed in the fan chamber 110, similarly to the outer case 12 of the first embodiment.

A uniform gap of about 5 mm is provided between the inner box 21 and the outer box 22 . However, the inner box 21 and the outer box 22 are fixed and supported, respectively, and there may exist a region where the inner box 21 and the outer box 22 contact each other in the supporting portion. As shown in FIG. 7, by providing a space between the inner box 21 and the outer box 22, the air that has passed through the space between the inner box 21 and the outer box 22 flows out from the opening 22c. It can be said that the machine room 120 and the fan room 110 are in communication.

The electrical component box 20 includes a double heat insulating plate 20a formed by the bottom surface of the inner box 21 (first heat insulating plate) and the bottom surface of the outer box 22 (second heat insulating plate), as shown in FIG. The double heat insulating plate 20 a is provided between the compressor 7 and the reactor 8 as heat generating components and the electrical board 50 . More specifically, the double heat insulating plate 20 a is arranged above the compressor 7 and the reactor 8 as heat generating components provided in the machine room 120 and below the electrical board 50 . Further, as described above, a gap (space) of about 5 mm is provided between the lower surface (first insulating plate) of the inner case 21 and the lower surface (second insulating plate) of the outer case 22 that constitute the double insulating plate 20a. ) is formed. Further, the bottom surface (first heat insulating plate) of the inner box 21 is made of, for example, a metal material, and the bottom surface (second heat insulating plate) of the outer box 22 is made of, for example, a resin material. That is, the lower surface of the outer case 22 (second heat insulating plate) is made of a material having a lower thermal conductivity than the lower surface of the inner case 21 (first insulating plate).

The electrical board 50 has the same configuration as in the first embodiment. However, in the outdoor unit of the present embodiment, as shown in FIGS. 7 and 8, the printed circuit board 51 of the electrical circuit board 50 is exposed to the outside of the inner box 21, and the inner box 21 and the printed circuit board are provided. 51 and the heat sink base plate 53a of the heat sink 53 form a closed space.

Here, the electrical board 50 will be described in detail. In the electrical board 50, the electrical components 52 are arranged on the lower surface (lower side) of the printed board 51, and the solder portions of the electrical components 52 are provided on the upper surface (upper side) of the printed board 51. be done. Further, in this embodiment, the electrical board 50 is exposed to the outside of the inner box 21 . Therefore, in order to protect the soldered portions of the electrical components 52, the upper surface of the electrical board 50, that is, the upper surface of the printed circuit board 51, which is exposed from the inner box 21, is coated with a moisture-proof insulation coating agent. The material of the coating agent is, for example, urethane resin.

Even with the outdoor unit of the present embodiment configured in this way, the same effects as the outdoor unit 1000 of the first embodiment are obtained.

In addition, in the outdoor unit of the present embodiment, the surface of the electrical board 50 is exposed from the inner box 21, and the upper surface of the electrical board 50 is directly exposed to the air flowing in from the opening 22b of the outer box 22. , the heat dissipation of the electrical component 52 is further accelerated, and the reliability can be improved.

Furthermore, in the outdoor unit of the present embodiment, the electric component board 50 is configured integrally with the inner box 21, so there is an effect that the electric component box 20 can be made smaller.

Embodiment 3.
An outdoor unit of an air conditioner according to Embodiment 3 will be described with reference to FIG. FIG. 9 is a front view of the portion corresponding to the portion A in FIG. 1 in the outdoor unit of the present embodiment.

As shown in FIG. 9, the outdoor unit of the present embodiment is provided with an electrical component box 31 instead of the electrical component box 10 provided in the A section of the outdoor unit 1000 of the first embodiment. It is different from the first embodiment in that a double heat insulating plate 30 is constituted by the lower surface of (first heat insulating plate) and a heat insulating plate 32 (second heat insulating plate). Since other configurations are the same as those of the outdoor unit 1000 of Embodiment 1, different points will be mainly described below.

The electrical component box 31 corresponds to the inner box 11 of the electrical component box 10 of Embodiment 1, as shown in FIG. That is, the electrical component box 31 does not have a configuration corresponding to the outer case 12 of the electrical component box 10 of the first embodiment.

The electrical component box 31 is provided across the fan room 110 and the machine room 120, as shown in FIG. An outlet 31a for electrical wiring is formed on the lower surface of the electrical component box 31 on the side of the machine room, like the inner box 11 of the first embodiment. The electrical component box 31 houses an electrical board 50 inside.

A heat insulating plate 32 is provided below the electrical component box 31 . The heat insulating plate 32 is a plate-like component corresponding to the lower surface of the outer case 12 of Embodiment 1, and is provided on the machine room side. The heat insulating plate 32 (second heat insulating plate) is desirably made of resin with low thermal conductivity. The insulating plate 32 is formed with an outlet 32a for electrical wiring, as in the case 12 of the first embodiment.

A uniform gap of about 5 mm is provided between the lower surface of the electrical component box 31 and the heat insulating plate 32 . As described above, the outdoor unit of the present embodiment includes the double heat insulating plate 30 composed of the lower surface (first heat insulating plate) of the electrical component box 31 and the heat insulating plate 32 (second heat insulating plate). The double heat insulating plate 30 is provided between the compressor 7 and the reactor 8 as heat generating components and the electrical board 50 . More specifically, the double heat insulating plate 30 is arranged above the compressor 7 and the reactor 8 as heat generating components provided in the machine room 120 and below the electrical board 50 . Further, as described above, a gap (space) of about 5 mm is provided between the lower surface of the electrical component box 31 (first heat insulating plate) and the heat insulating plate 32 (second heat insulating plate) that constitute the double heat insulating plate 30. is formed. Furthermore, the lower surface (first heat insulating plate) of the electrical component box 31 is made of, for example, a metal material, and the heat insulating plate 32 (second heat insulating plate) is made of, for example, a resin material. That is, the heat insulating plate 32 (second heat insulating plate) is made of a material having a lower thermal conductivity than the lower surface (first heat insulating plate) of the electrical component box 31 .

Also, in the present embodiment, the side panel 206 of the housing 200 does not need to be formed with an intake port. This is because, in the present embodiment, the electrical component box 31 has a single layer structure and air does not flow between the electrical component box 31 and the heat insulating plate 32 . Even with such a structure, since the double heat insulating plate 30 forms a heat insulating layer with air, the heat insulating property between the heat generating component and the electrical board 50 can be improved, and the reliability of the outdoor unit can be improved. can be done.

In addition, in the outdoor unit of the present embodiment, the electric component box 31 has a configuration corresponding to the inner box 11 of the first embodiment, so that the electric component box 31 can be miniaturized.

In the present embodiment, the electrical component box 31 and the heat insulating plate 32 are described as separate structures, but the electrical component box 31 and the heat insulating plate 32 may be integrated to constitute the electrical component box. That is, in other words, the lower surface of the electrical component box may be configured to have a structure of a double heat insulating plate composed of a first heat insulating plate and a second heat insulating plate. Even with such a configuration, similar effects can be obtained.

Embodiment 4.
An outdoor unit of an air conditioner according to Embodiment 4 will be described with reference to FIG. FIG. 10 is a front view of a portion of the outdoor unit of the present embodiment corresponding to part A in FIG.

As shown in FIG. 10, the outdoor unit of the present embodiment is provided with a heat sink holder 43 and a double heat insulating plate 40 instead of the electric component box 10 provided in the A part of the outdoor unit 1000 of the first embodiment. It is different from the first embodiment in this point. Since other configurations are the same as those of the outdoor unit 1000 of Embodiment 1, different points will be mainly described below.

As shown in FIG. 10, the heat sink holder 43 is provided across the fan room 110 and the machine room 120, surrounds the heat sink 53 and supports the electrical board 50. Here, the case where the heat sink holder 43 is provided so as to cover the entire printed circuit board 51 is shown, but it is not limited to this, and at least the heat sink 53 side, that is, the fan chamber 110 side may be covered. Just do it.

The double heat insulating plate 40 is composed of an upper heat insulating plate 41 (first heat insulating plate) and a lower heat insulating plate 42 (second heat insulating plate). The upper heat insulating plate 41 (first heat insulating plate) and the lower heat insulating plate 42 (second heat insulating plate) are plate-shaped members. The double heat insulating plate 40 is provided between the compressor 7 and the reactor 8 as heat generating components and the electrical board 50 . More specifically, the double heat insulating plate 40 is arranged above the compressor 7 and the reactor 8 as heat generating components provided in the machine room 120 and below the electrical board 50 . A gap (space) of about 5 mm is formed between the upper heat insulating plate 41 (first heat insulating plate) and the lower heat insulating plate 42 (second heat insulating plate) that constitute the double heat insulating plate 40 .

The upper heat insulating plate 41 is formed with an outlet 41a for electrical wiring, like the lower surface of the inner box 11 of the first embodiment. A lower heat insulating plate 42 provided below the upper heat insulating plate 41 is formed with an outlet 42a for electrical wiring, like the heat insulating plate 32 of the third embodiment. At least the lower heat insulating plate 42 of the upper heat insulating plate 41 and the lower heat insulating plate 42 is preferably made of a resin material having low thermal conductivity. That is, it is desirable that the lower heat insulating plate 42 (second heat insulating plate) be made of a material having a lower thermal conductivity than the upper heat insulating plate 41 (first heat insulating plate).

Also, in the present embodiment, the side panel 206 of the housing 200 does not need to be formed with an intake port. This is because the feature of this embodiment is that the double heat insulating plates 40 enhance the heat insulating performance, and the structure is not such that the air flows through the space formed between the double heat insulating plates 40 .

In order to maintain the rigidity of the double heat insulating plate 40, the upper heat insulating plate 41 and the lower heat insulating plate 42, which constitute the double heat insulating plate 40, may be connected by ribs or the like at a plurality of locations in the plane. is. However, by using resin with low thermal conductivity as the material of the ribs, it is possible to effectively insulate heat from below.

It should be noted that appropriate combinations, modifications, and omissions of the embodiments are also included within the scope of the present disclosure.

2 Heat exchanger, 3 Blower fan, 4 Support plate, 5 Bell mouth, 5a Protruding part, 7 Compressor (heat generating part), 7a Anti-vibration rubber, 8 Reactor (heat generating part), 9 Cushion material, 10, 20, 31 Electrical component box, 10a, 20a, 30, 40 Double heat insulation board, 11, 21 Inner box, 12, 22 Outer box, 32 Heat insulation board (second heat insulation board), 41 Upper heat insulation board (first heat insulation board ), 42 lower heat insulation plate (second heat insulation plate), 43 heat sink holder, 50 electrical board, 51 printed circuit board, 52 electrical components, 52a power supply control component, 52b capacitor, 52c resistor, 52d coil, 53 heat sink, 53a heat sink base Plate, 53b heat radiation fin, 100 partition plate, 110 fan room, 120 machine room, 200 housing, 201 top panel, 202 bottom panel, 203 front panel, 204 rear panel, 205, 206 side panels, 1000 outdoor unit.

Claims

A housing whose interior is divided into a fan room and a machine room by a partition plate;
a heat exchanger provided in the fan chamber;
a blower fan that draws air into the fan chamber from outside the housing;
a heat-generating component provided in the machine room;
an electrical board provided above the heat-generating component and including a printed circuit board and electrical components;
a double heat insulating plate provided between the heat-generating component and the electrical substrate and including a first heat insulating plate and a second heat insulating plate disposed below the first heat insulating plate with a space therebetween;
The outdoor unit of an air conditioner equipped with
The outdoor unit of an air conditioner according to claim 1, wherein the double heat insulating plate is provided above the heat-generating component and below the electrical board.
The outdoor unit of an air conditioner according to claim 1 or 2, wherein the second heat insulating plate is made of a material having a thermal conductivity lower than that of the first heat insulating plate.
The outdoor unit of the air conditioner according to any one of claims 1 to 3, wherein a part of an electrical component box that houses the electrical board constitutes at least part of the double heat insulating plate.
5. The outdoor unit of the air conditioner according to claim 4, wherein the electrical component box forms a closed space that accommodates at least the electrical components of the electrical substrate.
the electrical component includes a power control component fitted with a heat sink;
The heat radiation fins of the heat sink are exposed from the electrical component box,
The outdoor unit of the air conditioner according to claim 5, wherein the electric component box forms the closed space together with a part of the heat sink.
The electrical component box is
an inner box whose lower surface constitutes the first insulating plate and forms the closed space;
an outer box whose bottom surface constitutes the second heat insulating plate, surrounds at least the machine room side of the inner box, and has openings formed on the machine room side and the fan room side, respectively;
A space is formed between the inner box and the outer box,
7. The air blower according to claim 5 or 6, wherein the operation of the blower fan causes air to be taken into the space from the outside of the housing via the machine room, and the air is circulated to the fan room. air conditioner outdoor unit.
The outdoor unit of the air conditioner according to claim 7, wherein the printed circuit board is provided so as to be exposed from the inner box of the electric component box.
The outdoor unit of the air conditioner according to any one of Claims 1 to 3, wherein the first heat insulating plate and the second heat insulating plate are each formed of a plate-like member.